A new species of Uscana Girault (Trichogrammatidae: Hymenoptera) from the eggs of field bruchids

2004·1.4 MB·

by  H R Pajni

,
Journal of the Bombay Natural History Society, 101 (2), May-Aug 2004 285-287
A NEW SPECIES OF USCANA GIRAULT (TRICHOGRAMMATIDAE: HYMENOPTERA)
FROM THE EGGS OF FIELD BRUCHIDS
1
H.R. Pajni2andP.K.Tewari2'3
'Accepted April 2001
-’Department of Zoology, Panjab University, Chandigarh 160 014, Punjab, India,
-’Email: [email protected]
Anewparasitoid UscanabruchidiusiontheeggsoffourspeciesofBruchidius namelyB pvgomaculatus B saundersi
, ,
B aureus B multilineolatus all attackingAlbizzialebbek in thefield, hasbeen described. A keytothe known Indian
, ,
speciesofgenus Uscana isalsogiven.
Key words: Uscana bruchidiusi sp nov., Bruchidiuspygomaculatus, B saundersi B. aureus, B multilineolatus,
,
Albizzialebbek
INTRODUCTION
KeytothespeciesofGenus Uscana
UscanaGiraultisasmallgenusofTrichogrammatidae 1. Malewith hind femoranormal 2
—
(Girault 1911; Dout and Viggiani 1968) and includes about Malewith hind femoraswollen femoralisPajni &Sood.
20 species, which are mostly associated with the eggs of 2. Female antennal club with placoid sensilla formula 2:1 0:1
differentbmchtdbeetles(Mant 1935; Viggiani 1979;Fursov mukerjii Mam)
(
1987;Hutsetal. 1991;PajniandSood 1999).Onlytwospecies 3. Female antennal club with placoid sensilla formula 2:1:2:2
have so far been recorded from India i.e. Uscana mukerjii bruchidiusisp. nov
(Mant) from the eggs of stored product pest bmchtds and
Uscana femoralis Pajni and Sood from the eggs of Uscanabruchidiusisp. nov(Figs 1-7)
Conicobruchus albopubens (Pic.) attacking Cyamopsis
psoraloides DC. A third species has been found attacking the Description
eggs of four species of genus Bruchidius, namely Female: Bodyshort,flat, length0.30to0.42mm. Head
B pvgomaculatusArora,B. saundersi(Jek.),B aureusArora, and thorax pale yellow, abdomen slightly darker than other
andB multilineolatusArora,allofwhichattackthegreenseeds body parts; legs pale, becoming lighter at apices; eyes and
ofAlbizzialebbekBenth.Incidentally,onlytheabovementioned ocellicrimsonred, headalmostaslongaswideinfrontview,
threespecieshavebeenrecordedfromtheOrientalregion,with notwiderthanthorax. Mandiblesquadndentate. Pedicel 1.45
the remaining 17 known species having been recorded from timesas longaswide; annuletstwo, normal; antennalsocket
Palaearctic and Nearctic regions. The present species, though withitsuppermarginatmuchhigherlevelthanlowermargin
distinct from all described species, shows resemblance with ofeye; club 3.2 times as long as its greatest width at first
Uscana mukerjii, as both fall in the same group of species segment, with placoid sensilla 2:1:2:2, its fourth segment
fomuilated on the basis ofarrangement ofplacoid sensilla in pointed apically, with sides ofthe first segment 1.5 times as
thecluboftheantenna(Steffan 1954;PajniandSingh 1973). long as second segment; eyes asetose.
Mesoscutum 1.56timesaswideaslong,withtwopairs
OBSERVATIONS ofshort setae, with finely reticulate sculpture and stripe of
long reticulations in middle. Scutellum 2.2 times as wide as
The Family Trichogrammatidae can be distinguished long. PostphragmareachingabdominaltergiteIV,almostequal
from other families of Superfamily Chalcidoidea by the tolengthofmesonotum; scutumandscutellum 53:50.
presence of 3-segnrented tarsus without a stergil on the Forewing twice as long as its greatest width; fringe
foretarsusandbroadforewmgwithmarginalandstigmalveins about0.24ofgreatestwidthofwing; costal cell 1.84timesas
formingasinglecurve. Genus Uscanacanbeseparatedfrom long as marginal vein and 2.2 times as long as wide, with
other genera of Trichogrammatidae by a combination of 3 costal setae, 5 dorsal and3 ventral hairs; discal setulae and
characters including antenna with one or two annulets, veinlets obscure. Hindwing about 6.75 times as long as its
4-segmentedantennalclubwithplacoid,fungoidandchaetoid greatestwidth, itsfringe 1.31 timesthegreatestwidthoffree
sensilla,straightandthickenedmarginalveinandstigmalvein membrane.
with a constricted neck. The distribution ofplacoid sensilla Abdomen 1.69 times as long asthorax; Ovipositornot
on the female antennal club separates different species. protruding,almostequalto lengthofmidtibia(47:48).
NEW DESCRIPTIONS
Fig 1: Uscanabruchidiusisp. nov.;
A Male;B.Antennamale;C.Antennafemale;D Forewingfemale; E. Hindwingfemale,F. Mandiblefemale,
G.Genitaliamale
Male:Length0.30to0.46mm.Pedicel 1.20timesaslong material in Entomology Section, Department of Zoology,
as wide; antennal annulets 2; club 2.4 times as long as its PanjabUniversity,Chandigarh;underAccessionNo. 138.
greatest width at first segment and 1.6 times as long as Distribution: ShivalikforestareanearChandigarhand
segments 1 and2 combined,withsecondandfourthsegments Chandigarh-Mullanpurroad.
subequal; distributionofplacoidsensilla0:1:0:1. Biology: The species, in nature, attacks the eggs offour
Forewing 2.25 timesas longas itsgreatestwidth, with species of Bruchidius infesting Albizzia lebbek in the wild.
fringe one third ofitsgreatest width; discal setulae arranged However,itiscapableofparasitisingtheeggsofCallosobnichus
in 17 rows, with 14 ofthem uniform. Hindwing 6.92 times maculatus (Fab.) in the laboratory and is being exploited for
longer than its greatest width; fringe 0.65 times the greatest accepting the eggs ofstored product bruchids as its host.
width offreemembrane. Malegenitaliawithphallobase2.92 Etymology: The specieshasbeen namedafterits host
times as long as wide. Bruchidius four species of which are attacked by the egg
,
Material: Holotype: Male, from eggs ofBruchidius parasitoid.
pygomaculatus, B. saundersi, B. aureus and Discussion: The new species is different from both
B multilineolatus attacking seeds ofAlbizzia lebbek Benth U. mukerjii and U.femoralis as its body is entirely pale
(Sann)Coll. P.K.Tewari, 16.ix.1999;Chandigarh. Paratypes: yellowish, compared to the black body of U. mukerjii and
6 males, 4 females; collection data same as holotype. Type partly black body of U.femoralis. Taxonomically, the new
286 1 Bombay Nat. Hist. Soc., 101 (2), May-Aug 2004
NEW DESCRIPTIONS
species is close to U. mukerjii as the first segment of the ACKNOWLEDGEMENTS
female club in both the species carries two placoid sensilla.
This is according to the classification ofUscana species by The authors thank the University Grants Commission
Steffan (1954), extended by Pajni and Singh (1973). for financing a project on parasitoids ofBruchidae and the
Furthermore, U.femoralisisdistinctinhavingcharacteristic Chairman, Department ofZoology. Panjab University, for
greatlyswollenhindfemorainthemale. researchfacilities.
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J. Bombay Nat. Hist. Soc., 101 (2), May-Aug 2004 287